Cannot stage files that've been delted

When a file is deleted the latest version of Source Tree can't stage the delete file so I can't commit the file deletion.

In my case a file has been renamed in Windows Explorer e.g. file_ver_0129.c has become _file_ver_0130.c Source Tree sees this as one file being added and one flle being deleted - I have added and committed the new file to the repository, but when I attempt to stage/commit the deleted file I get the error:

git -c diff.mnemonicprefix=false -c core.quotepath=false rm -q -f – file_ver_0129.c
fatal: pathspec 'file_ver_0129' did not match any files

Completed with errors, see above.